Microchip MRF24WB0MA 2.4GHz Wi－Fi解决方案

Microchip公司的MRF24WB0MA/MRF24WB0MB是低功耗2.4 GHz, IEEE Std. 802.11b兼容的RF收发器模块,表面安装模块(尺寸32mmx31mm),具有所有的RF元件如晶振,旁路和片压无源元件,MAC,基带,RF和功率放大器,以及支持AES和TKIP (WEP, WPA, WPA2安全)的硬件.数据速率领1和2Mbps,IEEE Std. 802.11b/g/n兼容,工作电压2.7V–3.6V, ISM频段2.400–2.484 GHz,DSSS调制,1Mbps的灵敏度-91dBm,输出功率+10dBm可控,主要用在智能电表,消费类电子,遥控设备管理和零售业.本文介绍了MRF24WB0MA主要特性,方框图,应用电路图以及Wi-Fi通用演示板主要特性,电路图和元件布局图及主要元件.

The MRF24WB0MA and MRF24WB0MB are low-power,2.4 GHz, IEEE Std. 802.11-compliant, surface mount modules with all associated RF components – crystal oscillator, bypass and bias passives with integrated MAC, baseband, RF and power amplifier, and built-in hardware support for AES, and TKIP (WEP, WPA, WPA2 security). The integrated module design frees the designer from RF and antenna design tasks and regulatory compliance testing, ultimately providing quicker time to market.

The MRF24WB0MA module is approved for use with the integrated PCB meander antenna.

The MRF24WB0MB comes with an ultra miniature coaxial connector (U.FL) and is approved for use with a list of pre-certified antennas.

The MRF24WB0MA/MRF24WB0MB modules are designed to be used with Microchip’s TCP/IP software stack. The software stack has an integrated driver that implements the API that is used in the modules for command and control, and for management and data packet traffic.

The combination of the module and a PIC running the TCP/IP stack results in support for IEEE Standard 802.11 and IP services. This allows, the immediate implementation of a wireless web server.

The MRF24WB0MA/MRF24WB0MB modules have received regulatory approvals for modular devices in the United States (FCC), Canada (IC), and Europe (ETSI). The modular approval removes the need for expensive RF and antenna design, and allows the end user to place the modules inside a finished product and not require regulatory testing for an intentional radiator (RF transmitter). They also have Radio Type Approval Certification for Japan.

MRF24WB0MA主要特性:

• IEEE Std. 802.11-compliant RF Transceiver

• Serialized unique MAC address

• Data Rate: 1 and 2 Mbps

• IEEE Std. 802.11b/g/n compatible

• Small size: 21mm x 31mm 36-pin Surface Mount Module

• Integrated PCB antenna (MRF24WB0MA)

• External antenna option (MRF24WB0MB) with ultra miniature coaxial (U.FL) connector

• Range: up to 400m (1300 ft.)

• Easy integration into final product – accelerates product development, provides quicker time to market

• Radio regulation certification for United States (FCC), Canada (IC), Europe (ETSI) and Japan (ARIB)

• Wi-Fi® certified (WFA ID: WFA7150)

• Designed for use with Microchip microcontroller families (PIC18, PIC24, dsPIC33, and PIC32) with downloadable Microchip TCP/IP Stack Operational:

• Single operating voltage: 2.7V–3.6V (3.3V typical)

• Temperature Range: -20℃ to +85℃ extended commercial

• Simple, four-wire SPI interface with interrupt

• Low-current consumption:

- RX mode – 85 mA (typical)

- TX mode – 154 mA (+10 dBm typical)

- Sleep – 250 μA (typical)

- Hibernate –<0.1 μA (typical)

RF/模拟特性:

• ISM Band 2.400–2.484 GHz operation

• 14 Channels selectable individually or domainrestricted

• DSSS Modulation

• Data Rate – 1000 kbps

• -91 dBm Typical sensitivity at 1 Mbps

• +10 dBm Typical output power with control

• Integrated low phase noise VCO, RF frequency synthesizer, PLL loop filter and PA

• Digital VCO and filter calibration

• Integrated RSSI ADC and I/Q DACs, RSSI readings available to host

• Balanced receiver and transmitter characteristics for low power consumption

MAC/Baseband Features:

• Hardware CSMA/CA access control, automatic ACK, and FCS creation and checking

• Automatic MAC packet retransmit

• Hardware Security Engine for AES and RC4-based ciphers

• Supports 802.1x, 802.1i security: WEP, WPA-PSK, and WPA-2-PSK.

MRF24WB0MA应用:

• Utility and Smart Energy

- Thermostats

- Smart Meters

- White Goods

- HVAC

• Consumer Electronics

- Remote Control

- Internet Radio

- Home Security

- Toys

• Industrial Controls

- Chemical Sensors

- HVAC

- Security Systems

- M2M Communication

• Remote Device Management

- Location and Asset Tracking

- Automotive

- Code Update

• Retail

- POS Terminals

- Wireless Price Tags

- Digital Remote

• Medical, Fitness, and Health care

- Glucose Meters

- Fitness Equipment

- Patient Asset Tracking

图1.MRF24WB0MA/MRF24WB0MB方框图

图2.MRF24WB0MA/MRF24WB0MB案例应用电路图

Wi-Fi通用演示板

The Wi-Fi Comm Demo Board provides a low-cost and portable development system for Microchip’s MRF24WB0MA 802.11b RF Transceiver module.

The Wi-Fi Comm Demo Board is preloaded with the demo software for the user to explore the features of the MRF24WB0MA Wi-Fi module. It is also expandable through an expansion interface, which allows the user to extend its functionality by adding various sensor expansion boards.

The Microchip Wi-Fi Comm Demo board provides a compact  development platform for customers to evaluate Microchip’s Wi-Fi product offering. The demo board comes with onboard MRF24WB0MA Wi-Fi module which is FCC/IC/ETSI certified along with a PIC32 MCU.

The demo board comes preloaded with the demo software for the user to explore the features of the MRF24WB0MA Wi-Fi module. It is also expandable through an expansion interface, which allows the user to extend its functionality by adding various sensor expansion boards.

This demo quickly shows how the Microchip agency certified Wi-Fi module can help connect products to popular 802.11b networks.

> Clicking LED icons on the web page will change the status of the LED on the board.

> Pressing push buttons on the board will be indicated on the web page.

图3.Wi-Fi通用演示板外形图

Wi-Fi通用演示板主要特性:

Over-the-air data rate: 1 & 2 Mbps (802.11b)

Standard Wi-Fi™ range expectation

> Indoor range of 50m+ (150’) with built-in antenna

> Outdoor, line of sight, >400m (1,200+’)

Supports 802.11 Infrastructure and Ad Hoc modes

Wi-Fi通用演示板包括:

DV102411 Demo Board

> MRF24WB0MA Wi-Fi Module

> PIC32 MCU

2 AAA Lithium Batteries

Product Information Sheet

图4.Wi-Fi通用演示板元件布局图及主要元件

The Wi-Fi Comm Demo Board includes the following key features:

1. MRF24WMB0MA RF Transceiver module

2. PIC32MX695F512H 32-bit microcontroller

3. MCP1642 +3.3V Boost regulator

4. Three status indicator LEDs

5. One push-button switch for user input

6. Power ON/OFF slider switch

7. 6-pin debug port

8. 8-pin sensor port


图5.Wi-Fi通用演示板电路图
详情请见:
81908
和
81909

来源：网络